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inb.cc

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/*
  inb.c

  Reports value of a x86 hardware port register.
  Parse command line, call inb(), and print result.

   Modification History:

   13-Jan-2000 WPS created.
*/


#ifndef linux

#include <stdio.h>
#include <stdlib.h>

int main()
{
  printf("inb doesn't work on this platform.\n");
  exit(-1);
}

#else

#include <unistd.h>
#include <sys/io.h>             // ioperm(), inb outb, inw outw
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>


int main(int argc, char **argv)
{
  unsigned long port;
  char val;

  if(argc < 2)
    {
      printf("usage: <port>\n");
      exit(-1);
    }

  port = strtoul(argv[1],NULL,0);
  if(geteuid() && getuid())
    {
      printf("Must be root for this program to work.\n");
      exit(-1);
    }

  if(-1 == iopl(3))
    {
      printf("Can't set privaledge level.\n");
    }
  val = inb(port);
  printf("0x%X\n",val);
  exit(0);

}
#endif

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